Resume

Adrian Madrid

Staff / Senior Backend Engineer

Distributed Systems  ·  Payments  ·  Reliability  ·  Ruby on Rails

Salt Lake City area, UT • adrian.madrid@timeworxs.com

linkedin.com/in/aemadrid • timeworxs.com

Download PDF

Availability

Engagement
1099 / independent contractor only
Work mode
Fully remote
Or hybrid, if the office is in the Salt Lake City area.
Based in
West Valley City, UT
Not relocating.

Summary

Staff backend engineer with extensive experience designing and operating high-integrity distributed systems and large-scale payment pipelines.

  • Led architecture and delivery of a multi-method payment platform, improving transaction reliability and cutting mean-time-to-recovery.
  • Built event-driven services using Ruby on Rails, Kafka, PostgreSQL, and AWS, implementing idempotent workflows and full observability.
  • Established payment data handling boundaries and production data privacy controls enforced in CI.

Experience

pmtbox

May 2026 — Present

Senior Software Engineer

  • Designed and shipped a versioned public API and its projection pipeline in Ruby on Rails, with declared payload contracts and idempotent retries.
  • Built the production-data privacy program end to end — safe development data, automated policy enforcement, and fail-closed safeguards.
  • Stood up an isolated staging environment with automated deploys; managed cloud infrastructure as code and led production migrations without downtime.
  • Owned reliability and observability — SLOs, dashboards, and alerting defined as code, queue and latency instrumentation, alert-noise reduction, and load testing to find saturation points before production did.
  • Authored architecture decision records and made each standard enforceable in CI rather than in review; built tooling so AI-assisted development ships under the same automated guardrails.

Acima Credit

Nov 2013 — Apr 2026

Senior / Lead Developer

  • Owned the architecture and delivery of distributed payment systems (ACH, card, virtual card, and alternative methods) using Kubernetes, Docker, and AWS, ensuring data correctness, successful reconciliation, and safe operations, which maintained high transaction accuracy.
  • Architected event-driven services with Ruby on Rails, Kafka, SQS, Sidekiq, PostgreSQL, Redis, and AWS, creating idempotent workflows and DLQ/backfill strategies that improved system reliability and reduced processing failures.
  • Defined reconciliation guarantees and ledger-adjacent schemas that provided full traceability and enabled safe backfills, allowing the team to quickly resolve discrepancies.
  • Implemented structured logging, correlation IDs, distributed tracing, and SLO-driven monitoring to reduce MTTR and alert noise.
  • Authored ADRs and migration plans; led cross-team design reviews and phased rollouts to reduce business risk.
  • Mentored engineers through pairing and code reviews using GitHub pull requests, establishing shared ownership and clearer design review practices, which improved code quality and shortened review cycles.

North Point Advisors

Sep 2010 — Aug 2013

Lead Developer

  • Led backend architecture and API redesigns across multiple applications, improved reliability and maintainability through schema and deployment changes.
  • Collaborated with stakeholders to translate business requirements into durable technical solutions.

HyperXMedia / Prefab Markets

Jun 2002 — Feb 2009

Lead Developer

  • Managed web development and Linux infrastructure; implemented deployment and monitoring practices to improve uptime.

Selected projects

Payment Pipeline Modernization

Replaced brittle batch flows with event-driven processing, introduced idempotency keys and DLQ handling, and improved operational safety for settlement and reconciliation.

Schema & Performance Redesign

Reworked PostgreSQL schemas and indexing strategies to support multi-tenant workloads and long-term scalability.

Observability & SLOs

Implemented structured logs, distributed tracing, and SLOs to reduce on-call load and accelerate incident diagnosis.

Core competencies

Languages & Frameworks

Ruby Ruby on Rails

Data

PostgreSQL PostGIS MySQL Redis

Messaging & Async

Kafka Amazon SQS Sidekiq

Cloud & Infrastructure

AWS Google Cloud Platform (Cloud Run, Cloud SQL, Cloud DNS) Kubernetes Docker Terraform / OpenTofu

CI/CD & Delivery

GitHub Actions CI/CD TDD

Observability & Reliability

Prometheus / Grafana OpenTelemetry New Relic Sentry k6 Reliability Engineering

Architecture

System Design REST / JSON

AI

AI-assisted development / coding agents

Education

Brigham Young University

Information Management — Incomplete